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Lithium-iron disulfide primary battery

a technology of lithium iron disulfide and primary battery, which is applied in the direction of non-aqueous electrolyte cells, cell components, electrochemical generators, etc., can solve the problems that the addition of potassium salt cannot achieve the satisfactory effect of suppressing the elevation of open circuit voltage and poor solvent power

Inactive Publication Date: 2005-05-05
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] Accordingly, it is desirable to provide a lithium-iron disulfide primary battery which can suppress an elevation of an open circuit voltage during the storage of battery.
[0026] As mentioned above, according to the embodiment of the present invention, the elevation of the open circuit voltage of the lithium-iron disulfide primary battery during the storage can be suppressed, thus realizing a high-quality lithium-iron disulfide primary battery.
[0027] According to the embodiment of the present invention, a potassium salt is added to the organic solvent, and therefore the elevation of the open circuit voltage of the lithium-iron disulfide primary battery during the storage can be suppressed, thus realizing a higher-quality lithium-iron disulfide primary battery.
[0028] According to the embodiment of the present invention, not only the lowering of the electrostatic capacity but also the elevation of the open circuit voltage of the battery during the storage can be suppressed, thus realizing a higher-quality lithium-iron disulfide primary battery.

Problems solved by technology

However, in the above-mentioned battery, the electrolytic solution has a very poor solvent power for a potassium salt, and therefore only an extremely slight amount (0.001 to 0.05 mol / l) of a potassium salt can be added into the electrolytic solution.
For this reason, the addition of the potassium salt cannot offer a satisfactory effect of suppressing the elevation of the open circuit voltage.

Method used

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Examples

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Effect test

example 1

[0082] First, 98.0% by weight of iron disulfide as a cathode active material, 1.0% by weight of carbon powder as an electrical conductor, and 1.0% by weight of a binder (dry weight) were mixed together, and satisfactorily dispersed in N-methyl-2-pyrrolidone (NMP) as a solvent to prepare a cathode composition slurry. As the iron disulfide which is a cathode active material, “HG-PPC #250”, manufactured and sold by Dowa Mining Co., Ltd., was used. As the carbon powder, “DENKA BLACK HS-100 (powdery)”, manufactured and sold by Denki Kagaku Kogyo Kabushiki Kaisha, was used, and, as the binder, “BM-500B”, manufactured and sold by ZEON CORPORATION., was used.

[0083] Then, the cathode composition slurry was applied to both surfaces of a cathode current collector, and dried at 120° C. for 2 hours to evaporate NMP, followed by compression molding under a constant pressure, to prepare a strip positive electrode 2. As the cathode current collector, a strip aluminum foil having a thickness of 20 ...

example 14

[0090] Substantially the same procedure as in Example 1 was repeated except that, instead of the mixed solvent including 1.0% by volume of N,N-dimethylformamide (DMF) as analkylamide solvent and 99.0% by volume of 1,2-dimethoxyethane (DME) as a chain ether solvent, a mixed solvent including 1.0% by volume of N,N-dimethylformamide (DMF) as an alkylamide solvent and 99.0% by volume of 1,3-dioxolane (DOL) as a cyclic ether solvent was used to obtain a lithium-iron disulfide primary battery.

example 27

[0093] Substantially the same procedure as in Example 1 was repeated except that, instead of the mixed solvent including 1.0% by volume of N,N-dimethylformamide (DMF) as an alkylamide solvent and 99.0% by volume of 1,2-dimethoxyethane (DME) as a chain ether solvent, a mixed solvent including 1.0% by volume of N,N-dimethylformamide (DMF) as an alkylamide solvent and 99.0% by volume of methyl propionate (MP) as a chain carboxylic acid ester solvent was used to obtain a lithium-iron disulfide primary battery.

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Abstract

There is provided a lithium-iron disulfide primary battery capable of suppressing the elevation of the open circuit voltage during the storage of battery. The lithium-iron disulfide primary battery has a positive electrode, which has iron disulfide as a cathode active material, including a cathode composition layer formed on a cathode current collector, a negative electrode including lithium as an anode active material, and an electrolytic solution including an electrolyte dissolved in an organic solvent. The organic solvent includes at least an alkylamide solvent. By this construction of the battery, the elevation of the open circuit voltage of the lithium-iron disulfide primary battery during the storage may be suppressed. Therefore, even after being stored for a long term, the lithium-iron disulfide primary battery can maintain compatibility with 1.5-V class primary batteries and the like.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] The present document is based on Japanese Priority Document JP2003-376250, filed in the Japanese Patent Office on Nov. 5 2003, the entire contents of which being incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a lithium-iron disulfide primary battery which includes a positive electrode that uses iron disulfide as a cathode active material, a negative electrode that uses lithium as an anode active material, and an electrolytic solution. [0004] 2. Description of Related Art [0005] 1.5-V class primary batteries currently commercially available include a manganese battery, an alkaline manganese battery, a silver oxide battery, an air battery, and a nickel-zinc battery, each using an aqueous solution as an electrolytic solution, and a lithium-iron disulfide primary battery using an organic solvent in an electrolytic solution. [0006] Among these batteries, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/02H01M6/16
CPCH01M4/382H01M4/5815H01M2300/0037H01M6/168H01M6/164
Inventor YAMAMOTO, KENTA
Owner SONY CORP
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